Yes - there is virtually no limit to how many female guppies can live together.
You do not say if the guppies are common guppies or fancy, also how many male and female guppies you have, yes as far as the snails and guppies go, one point to remember is the tank water should be above 72 degrees and some live floating plants for the guppies too hide in.
What are guppies
Yes, i have them in the same tank and they're fine
Yes but make sure they have enough room
Platys and black skirt tetras can live together. Harlequin rasboras, platys, and guppies are smaller than black skirt tetras and would do well together. However, the black skirts nip at fins, so if you have fancy tail guppies it is not recomended to put them in a smaller tank together.
yes.
Yes. Guppies normally get along well with each other. If there is a female in the group they will all try and win her affection if they are interested in her. They will still get on fine.
Female guppies stay very plain to help with camouflage. Male guppies get color to attract females.
NO! you will need at least 5 gallon for those
guppies have live fry
Yes, they are about the same size and they both community fish.
The male first inserts his gonopodium into the female's cloaca, and fertilizes the eggs internally. Guppies are live bearers, so the female gives birth to live young that immediately fend for themselves.